View Full Version : Stepper and Controller Identity?

08-07-2005, 05:01 PM
Like Dan and a few others, I've been going through my chest of electronic junk. I came across two of these steppers with BLDC controllers. I don't recall the plotter they came from but was wondering if anyone knows where to locate specs on the controller.



08-07-2005, 05:29 PM
have you tried www.shinano.com? (http://www.shinano.com?)

08-07-2005, 05:34 PM
Yep. They don't list the motor anymore and the controller is probably sourced by the printer mfg. to someone else. The PSW output (8-pin) is at the top of the board and the input (20-pin, 11 used I think) at the bottom.

08-07-2005, 06:51 PM
Take the numbers off those chips and do a google search, find a spec sheet on those, you can probably use em.

08-08-2005, 01:04 AM
I'm having a hard time reading the printing on the chips, can you zoom a bit more or figure out what they say?
There's one National and two ST chips, try searching for the part #s there:

08-08-2005, 08:47 PM
The lower left chip is S9312AG:
General Description
These data selectors/multiplexers contain inverter/drivers to supply full complementary, on-chip, binary decoded data selection.

The 9312 is a single 8-bit multiplexer with complementary outputs and a strobe control. When the strobe is low, the function is enabled. When a high logic level is applied to the strobe, the output is forced to the logic zero state regardless of the logic level of the data inputs.

Selects one-of-eight data sources
Performs parallel to serial conversion
Strobe controlled outputs
Complementary outputs

The lower right is an LM393:
General Description
The LM193 series consists of two independent precision voltage comparators with an offset voltage specification as low as 2.0 mV max for two comparators which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage. These comparators also have a unique characteristic in that the input common-mode voltage range includes ground, even though operated from a single power supply voltage.

The top two are L6201:
DMOS Full Bridge Drivers.

Soooooooo, I guess the boards will take a parallel input and run the motor. ???

08-08-2005, 10:10 PM
I got one just like it. I have not invested the time to look into it. Mine came out of a calcomp plotter.


08-08-2005, 10:17 PM
Im not quite sure how multiplexers work yet. THe LM chip is a low voltage cutoff regulator. The top 2 are the key drivers for the steppers. I dont know enough to be much help here. I know with multiplexers, you can use them to expand the amout of io ports you have with a microcontroller.

08-08-2005, 10:35 PM
Yes David, That's it! Come to think of it, the motors did come from a Calcomp Plotter. I've got two servos (Buhler?) that came out of an HP Plotter too.

If you haven't tried to work these, then I'm just waisting my time. http://bbs.homeshopmachinist.net//biggrin.gif

08-08-2005, 11:10 PM
What are you building? I may be tripping over just the thing you need? I gave away a whole box of servo motors here the other day. I trashed 3 near new inverters and one was a 20hp.. problem was they were 460. I ebayed they twice, last time for $20.. the 20hp cost $6,000, the junk man didn't get a nickel for it.


08-08-2005, 11:19 PM
Them stepper/syncronous motors, some have 4 taps pulled into the peckerhead.

Now, the resistance would be quite high since they are wound for 120 volts. I wonder how they would do on a gecko? they are a 250oz motor at 120volt, 72 rpm..exact.. I threatened to build a giant clock. AS long as you fed them 60hz they'd keep time.

I sent a couple to TechTchr.. I don't think he was able to use them. To make them run on 120vac, you supply a resistor and capacitor, this phase shifts one coil behind the other and it runs in the directions it starts in. Switch the line to the other coil and it runs the other way, instant reverse. No harm in plugging them instant reverse. They come up to speed near instantly.
Now if you had some way of pulsing them with 120dc.. there'd be a motor. Geckos are good for 70vdc, any more they die.


08-08-2005, 11:57 PM
I'm not really building anything at the moment. I've been trying to get my place organized so I can make room for the Model T rebuild. I picked up a lot of tools at auction too that have been piled in a couple of cabnets and corners. I've put off the Model T going on three years now so I better "Gitter Dun" this winter. The T-parts are taking up too much space too. Dang, I'm still trying to finish the FEL for the Kenbota.

I'll just put the motors in a box and label it. I need another building.

08-09-2005, 01:40 AM
>> I gave away a whole box of servo motors here the other day. I trashed 3 near new inverters

Dang. I'm always on the lookout for stuff... Next time you are gonna' toss something, let me know, I might have a use for it... transformers, motors, caps, drives, lasers & optical heads, etc...

On the drawing board, so to speak, is a panel cutter (combo router, oxy-fuel, and plasma); a multi-slide turn/mill center, and a large 5-axis gantry mill (big enough to fit a car into... which is it's intended purpose; cutting the foam for composite car bodies). I'm also thinking about experimenting with EDM...


08-09-2005, 02:10 AM
Ya ain't got a email addy listed..

I got this bus you see? it is full and sagging on the springs.. It used to be a school bus, then I turned it into a tool-bus, then it is a storage bus. It runs and drives just fine, it is full up to the first windows *no seats.. just junk.. (ebay sales that fell through or never sold)

Now jus where do you want it parked? and how are you gonna get it there?
I may rob the engine out of it.. I need three actually right now for my projects.

08-09-2005, 04:00 AM
Uh... sorry - spam paranoia. http://bbs.homeshopmachinist.net//eek.gif

I can be reached at yahoo; my email address there is the same as my screen name here... just append the at yahoo dot com part.

As for the bus... Weeeellll.... You weren't kidding when you said "tripping over" stuff, were you? http://bbs.homeshopmachinist.net//biggrin.gif Hmmm... How about out behind our motor home? It's not that far of a drive out to CA... In fact, I might even throw in a brew or two when you get it here... http://bbs.homeshopmachinist.net//wink.gif Oh, what's that you say? You want me to drive it? Huh? Tow it? <cough> <cough> <sputter> <sputter> http://bbs.homeshopmachinist.net//eek.gif http://bbs.homeshopmachinist.net//wink.gif http://bbs.homeshopmachinist.net//biggrin.gif

Actually, what I had in mind - as much as the geek in me would love to get ahold of that bus; with visions of all sorts of bizarre (and not so bizarre) electromechanical gizmos dancing before my eyes - was just if you were going to toss something potentially useful, that I was interested in, I would Pay-pal-ize you for shipping and handling... (handling being the value of your time and effort for going out of your way to put it in a box and sending it to me)...


08-09-2005, 09:51 AM
The back end electronics of them inverters would have drove a edm. They normally have a capacitor bus of 600 volts, the twenty hp one would have stored enough energy to melt down a tip. The differences in 240/460 is a group of transformers in the back of the housing that run the control electronics. Normall they have five different voltages on board.

Never thought of that, I would have saved the big un for a edm here. Whilst I was filing a keyway yesterday a edm would have been nice. I had welded on the robot mower hubs and they were hardened nicely making the file skid instead of cut.


08-09-2005, 11:17 AM
CCWKen -
I got some servos off of eBay a while back when I was actively working on trying to CNC my Bridgeport. I find that the electronic stuff "front ending" some motors turns out to be more trouble than it's worth in many cases.
For steppers, it should be easy - you have the relavent info right there on the front of the motor: 2.8v, 1.8deg/step, 1.1A. You could probably run it on a semi-common 3.3v supply - either find a way to adjust the supply down a little, or put a big honkin' diode in series to drop a bit of voltage.
When I did this, I used the following setup:


That's a big stepper that came from an old "line" printer - I think it was a Manesman Tally 4000. (Footprint the size of a refridgerator) That's the paper feed motor. The drive is a totem-pole arrangement of bipolars, driving a couple of MOSFET-based H-bridge circuits. The inputs are 5v logic telling which motor coils to turn on, and the yellow power leads are the DC to power the big FETs and the motor. I can vary the big supply to give whatever the motor wants.


The whole thing is mounted on a "beer can" cap that serves as a bypass for the DC motor supply, and a handy mounting point.

I drive this with a little single board controller, but it could easily be driven by a Xilinx. Inputs would be "step left", "step right", and "clock".

Finally, yes, this is only "proof of concept". I don't actually use this to run anything just yet. If it would help, I can provide schematics and such.


08-09-2005, 11:31 AM
Man, if you over drove that cap and made it explode, BAM!

08-09-2005, 11:48 AM
Actually, I had one charged to 48v one time, and I accidentally welded a little screwdriver to it. Went bang, startled the hell out of me. So yeah, I'm a little cautious about that.

08-09-2005, 12:30 PM
Want to really be scared? be close by a tesla coil salt-water capacitor when it explodes. I started keeping all mine in a bucket for saftey.